It is possible that all 4 criteria are different. For example:
- 1 empty green circle
- 2 striped orange triangles
- 3 full purple rectangles
But those would be extremely hard to recognise. It's much easier, if at least one criteria is all the same:
- 1 empty green circle
- 2 striped orange circles
- 3 full purple circles
But they can not be all the same, simply because each card is unique.